<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>

    </style>
</head>

<body>
    <div>我是节点</div>
    <span>我是span</span>
    <ul>
        <li>我是li</li>
        <li>我是li</li>
        <li>我是li</li>
        <li>我是li</li>
    </ul>
    <div class="demo">
        <div class="box">
            <span class="erweima">x</span>
        </div>
    </div>

    <script>
        //1.父节点 parentNode
        var erweima = document.querySelector(".erweima");
        //var box = document.querySelector(".box");
        // 得到的是离元素最近的父节点(亲爸爸) 如果找不到就返回为 null
        console.log(erweima.parentNode);
    </script>
</body>

</html>